The `IUPAC` name of the compound
`CH_(3)-overset(CH_(3))overset(|)(C)=overset(H)overset(|)(C)-COOH`
is

Options

A. (1) `2`-methylbut-`2`-enoic acid
B. (2) `3`-methylbut-`3`-enoic acid
C. (3) `3`-methylbut-`2`-enoic acid
D. (4) `2`-methylbut-`3`-enoic acid

Answer

C

Explanation

The compound is an unsaturated carboxylic acid. Thus, it should be named as an alkenoic acid. The `C` atom of the `-COOH` group is always numbered `1`:
`overset(4)(CH_(3))-underset(3-"Methylbut-2-anoic acid")(overset(CH_(3))overset(3|)(C)=overset(2)(CH)-overset(1)(C)OOH)`